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simplify this code and fix PR1493, now that llvm-gcc3 is dead.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37478 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-06-06 20:51:41 +00:00
parent 037a704f4f
commit 4e2288b9de
1 changed files with 2 additions and 17 deletions
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19
lib/Transforms/IPO/Internalize.cpp
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@ -128,29 +128,14 @@ bool InternalizePass::runOnModule(Module &M) {
ExternalNames.insert("llvm.dbg.compile_units");
ExternalNames.insert("llvm.dbg.global_variables");
ExternalNames.insert("llvm.dbg.subprograms");
ExternalNames.insert("llvm.global_ctors");
ExternalNames.insert("llvm.global_dtors");
// Mark all global variables with initializers as internal as well.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (!I->isDeclaration() && !I->hasInternalLinkage() &&
!ExternalNames.count(I->getName())) {
// Special case handling of the global ctor and dtor list. When we
// internalize it, we mark it constant, which allows elimination of
// the list if it's empty.
//
if (I->hasAppendingLinkage() && (I->getName() == "llvm.global_ctors" ||
I->getName() == "llvm.global_dtors")) {
// If the global ctors/dtors list has no uses, do not internalize it, as
// there is no __main in this program, so the asmprinter should handle
// it.
if (I->use_empty()) continue;
// Otherwise, also mark the list constant, as we know that it will not
// be mutated any longer, and the makes simple IPO xforms automatically
// better.
I->setConstant(true);
}
I->setLinkage(GlobalValue::InternalLinkage);
Changed = true;
++NumGlobals;